In simple DC and universal motors, the rotor spins inside the stator. The rotor is a coil connected to the electric power supply and the stator is a permanent magnet or electromagnet. Large AC motors (used in things like factory machines) work in a slightly different way: they pass alternat...
Here's a little animation to summarize things and hopefully make it all clear: Two pairs of electromagnet coils, shown here in red and blue, are energized in turn by an AC supply (not shown, but coming in to the leads on the right). The two red coils are wired in series and energiz...
20K Did you know that magnets produce a magnetic field? When you run an electrical current through this field you create an electromagnet. Why would you want to do this? What purpose would an electromagnet have? Read on to find out. Related to...
Switch is an electrical component which can make or break electrical circuit automatically or manually. Switch is mainly works with ON (open) and OFF (closed) mechanism. Numerous circuits holdswitches that controlhow the circuit works or actuate different characteristics of the circuit. The classifica...
How an e-bike gave a cyclist a new lease of life. Why I’m proud to ride an e-bike by Philippa Perry, The Guardian, August 27, 2017. A typical member of the "e-bike target audience" puts power-assisted cycles to the test. The GeoOrbital Wheel Lets You Make Your Bike Electric in...
Here's how he solved the problem of storing and playing back sounds.Photo: How do you make an alien die of laughter? In the mid-1970s, when LP records were still considered the height of musical technology, the Voyager spacecraft blasted into space carrying gold-colored LP records ...
When the brake is applied, the electromagnet switches on and induces eddy currents in the disc, which create opposing magnetic fields and stop it rotating. Unlike in the motorcycle brake, there is no contact at all between the electromagnet and the brake disc: there's an air gap of a few...
Artwork: Inside an electrostatic loudspeaker: In this design, two large pieces of slate (gray, 1 and 3) are hollowed out to make an air space in between (21). Two conducting metal plates (red, 17 and 19) are fixed to the sides of the slate and a third, low-mass aluminum foil plat...
Coil: This becomes an electromagnet whenelectricityflows through it. Transparent plastic cone: This makes the sound when it moves. Sponsored links How bigger headphones work As you might expect there's nothing radically different inside bigger headphones: they're just a scaled-up version of what ...
Electromagnet: When the phone rings, this electrically controlled magnet switches on and off rapidly, moving a clapper in between the bells at the front and making them ring. The mechanism is similar to what you find in anelectric doorbell. It's great to watch this happening when you take ...